OpenAI: GPT-5.1-Codex-Max Multimodal

By OpenAI

GPT-5.1-Codex-Max is OpenAI’s latest agentic coding model, designed for long-running, high-context software development tasks. It is based on an updated version of the 5.1 reasoning stack and trained on agentic...

OpenRouter rank

#315

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Context window

400K tokens

Input price

$1.25 / 1M tok

Output price

$10.0 / 1M tok

Modalities

textimage

External ID

openai/gpt-5.1-codex-max

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